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The way it was balanced ended up being driven by the desire to get optimal piston oil cooling jet angles and that means some opportune adjustments to counterweight shapes:
The optimal squirter angle depends on the piston design. The stock angle would work with all piston designs, just not optimally for pistons with narrow skirt box. The ideal spray path is constrained by crankcase webs and crankshaft counterweights, and is a little different in 1&8 vs 2-7. Since box skirt pistons are lighter anyway, one can kill two birds with the same stone and balance the crank in a way that allows for better oil jet angle.
Here’s where the alternative spray locations hit with different squirter angles at piston TDC. Blue is stock ‘87 squirter angle, red is 10 degrees tilt with ample clearance on the crank weight, yellow is 10 degree tilt with minimum required clearance to crank weight:
For the hell of it, I think we’ll do one engine with stock angles and another with what we consider optimal angles.
Apropos nothing: So isn’t Massachusetts like Taliban Afghanistan? I’m telling my girls that if we go back to Massachusetts they’ll have to wear a burka and they can’t go to school.
An independent check of all the balanced component weights and the balance job. Looked pretty good, only minor adjustments suggested. Literally every outsourced operation is being checked, not just for the crankshaft but for everything.
If you think balancing machines in the US are old, you should see the people operating them! ;-) and yes the old people operating the old machines also work and at high level of competence, too, I might add. Old people working on cars and engines are generally smarter than young people working on cars and engines, at least in the US.
Old people means more experience gathered over many years. I think I will fit under that category. I have a Turner balancer which is fairly new and I found myself in a learning period before I got to know the machine fully.
What will happen when the old people are gone, are there anybody behind coming up? Over here it doesn´t look that way, young people are only intersted in the smart phone, everything else including sex seems less appealing.
Åke
Old people means more experience gathered over many years. I think I will fit under that category. I have a Turner balancer which is fairly new and I found myself in a learning period before I got to know the machine fully.
What will happen when the old people are gone, are there anybody behind coming up? Over here it doesn´t look that way, young people are only intersted in the smart phone, everything else including sex seems less appealing.
Åke
The machine in my photos may be old but I believe the optical sensors are recent. Yes, the smart millennials here are not interested in any of this stuff. I don’t know if they are interested in sex, I’m pretty sure that not with me but uncertain about their attitude on sex in general.
The balancer guy said the crank would now be good up to 10000 rpm with enough oil pressure...
Before I got my balancer I had a guy who used to balance stuff for me. He has quite an old balancing machine. I had some crankshafts and flywheels which he had balanced lying around and when I tested the stuff my new balancer showed imbalance that could be corrected to less tolerances. However, it does not say anything about how good a job your guy performed. Don't worry about the bobweights in the picture, it's a mockup. The mill mounted balancer is a smart idea. It can be tucked away when not in use saving floor space. The mill is used for hole drilling.
Åke
Last edited by Strosek Ultra; 05-22-2020 at 04:55 AM.
The guy who built that engine in the video used that same old balancing machine my crank was done on to balance the crank of the engine in the video. ;-)
The first complete oil squirter test install to non-squirter block:
Sadly, the womenfolk of my family want to return from Hawaii to the Puritan Talibania of Massachusetts where my girls can’t go to school and have to cover their faces in public... Half the unemployed get paid more on the dole than they did working and corpses with bullet holes are judged to have died of the flu. In which country do I live in again?!
In any case, just to soften the blow, the dealer will be delivering a new convertible for me there:
Tuomo, I did not say your guy did a lousy job, only that my guy with an old balancer did a less perfect job.
That is a very nice car. When money is no object, haven´t you considered the new four-seater from the largest sports car manufacturer in Sweden?
1700+ horsepower will even outperform a twin turbo 928. https://suchen.mobile.de/fahrzeuge/d...71dcfa&lang=en
Photo gallery: https://teknikensvarld.se/bildgaller...g-gemera-2020/
nice car Tuomo , but reminds me of my 650i convertible.... think the most expensive car /year i ever had. Bought it new ( think 13 years ago ) for exactly 100k euro and , 4 years later with 100k kilometers , i was "lucky" to get 25k for it …. no way i ever buy a new car again.
I also realized that many of those modern expensive complex cars aren't worth much once out of warranty... which counts for all brands of course.....in my case BMW renewed at very end of warranty the convertible system.... then i realized , out of warranty , the car wouldn't be worth it probably anymore ! unless of course one go's fiddling with it yourself…..
nice car Tuomo , but reminds me of my 650i convertible.... think the most expensive car /year i ever had. Bought it new ( think 13 years ago ) for exactly 100k euro and , 4 years later with 100k kilometers , i was "lucky" to get 25k for it …. no way i ever buy a new car again.
I also realized that many of those modern expensive complex cars aren't worth much once out of warranty... which counts for all brands of course.....in my case BMW renewed at very end of warranty the convertible system.... then i realized , out of warranty , the car wouldn't be worth it probably anymore ! unless of course one go's fiddling with it yourself…..
Barry, the 928s are rising in value, I think they were the cheapest around the year 2000.
Hard to see what model Tuomo bought, it must be an AMG. This is Mercedes' response to the BMW M8 Competition, which the king of Sweden recently acquired and for which he received much criticism for buying a car with an internal combustion engine.
Åke
correct Ake, i have read it on the news about the king buying "expensive" stuff in Corona time …. 928's rising in value ? perhaps yes over the past years when a 911 became crazy expensive . But from now on post Corona ? i don't know what the oldtimer market will do , and be honest , a model 928 is not direct everybody's wish …. if the market falls , sure a 928 will be in it …. in fact mostly the tin tops i'm afraid. I love my 928's for rally.... but for sunny sunday trips i prefer my Morgan.... no doubt .
What i regret … around the same time i bought the 650i , i looked at a Ford GT here local … nice car , was for sale at 150k....( don't remember the build year , must have been a 2004/5 or 6 ) … didn't do it , was afraid of running costs and sure in case of damage …. if i see now the asking prices…. that would have been a better deal than the Beemer.....
Barry, there is a red Strosek Ultra for sale in Germany. The asked price is 75K Euro which is about six times what I paid for the blue Strosek car and almost four times for the red Strosek Ultra back in 2000.
I paid a lot more for the oldest Strosek car back in 1986.
Åke https://suchen.mobile.de/fahrzeuge/d...2-878da45b45af
05-12-2020, 05:01 PM
The newly balanced crankshaft.
